Evening,

Noticed my 4.6 has been losing some coolant recently.
Pressurised the cooling system, and I can see drips dropping from the bottom of the wheel arch, just before the front driver (UK) wheel.
Pics/video:



Is there a common place where this leak could be coming from? Can't see anything from the top side, but it looks like it's right under the coolant expansion tank, which I'll remove tomorrow to get a better look.

Also noticed this very slight leak coming from the throttle housing:


Any common issues to look out for?
Thanks

There's a small tube goes to the bottom that can crack if you're rough with it. Or it could Just be one of the hose joints leaking

The bottom of the throttle body where the coolant runs through is held on by 3 tiny bolts, if the seiling surface is not perfect or if these bolts get over thightened or if the gasket gets old it will leak. Clean it properly, flatten and clean the little plates sealing surface with some sand paper on a piece of glass or granite counter top. Refit with a new gasket or some gasket maker and do not over tighten the bolts.

The coolant bottle leak could be the overflow from the cap but more probably like @kermit_rr said its one of the two hoses that have a crack, the one runs to the throttle heater the other to the top of the radiator.

blue_cheese said:

Evening,

Noticed my 4.6 has been losing some coolant recently.
Pressurised the cooling system, and I can see drips dropping from the bottom of the wheel arch, just before the front driver (UK) wheel.
Pics/video:

View attachment 344550

Is there a common place where this leak could be coming from? Can't see anything from the top side, but it looks like it's right under the coolant expansion tank, which I'll remove tomorrow to get a better look.

Also noticed this very slight leak coming from the throttle housing:
View attachment 344551

Any common issues to look out for?
Thanks

Click to expand...

Pressurise enough and it will blow coolant out the overflow which goes to the side and then underneath and then drips down the wing.

Grrrrrr said:

Pressurise enough and it will blow coolant out the overflow which goes to the side and then underneath and then drips down the wing.

Click to expand...

A pressure tester usually won't allow bypass like that. Assuming that's what's meant by pressurising the system